Addison UHA 150, Installation, Operation & Service Manual

Page: 39 / 62

SECTION 12: U
SER
I
NSTRUCTIONS
31 of 49
SECTION 12: USER INSTRUCTIONS
The UHA[X][S] Series heaters are f u lly a u tomatic
and operate from the external controls fitted on site.
12.1 Heater Operation
When the heater has b een s w itched on b y the
thermostat installed on site, the main bu rner w ill
a u tomatically t u rn on.
The bu rner control b ox w ill control the safe ignition
of the flame.
All heaters req u ire a constant gas and electricity
s u pply w hich m u st not b e interr u pted d u ring the
normal operation of this heater.
12.2 Li g htin g Instructions
12.2.1 To Turn On Heater
1. Ens u re that the electrical and gas s u pplies to
the heater are on. Check that the on site
controls are "ON".
IMPORTANT: The thermostat setting m u st b e a b ove
the am b ient temperat u re for the heater to operate.
2. The a u tomatic firing seq u ence w ill b egin as
descri b ed on Page 28, Figure 13 . The heater
w ill no w operate a u tomatically u nder the control
of the on site controls.
12.2.2 To Turn the Heater Off
Set the thermostat to the "OFF" position.
The bu rner w ill t u rn off immediately.
The fan w ill contin u e to r u n for 90 seconds.
To restart, t u rn the thermostat a b ove room
temperat u re.
12.3 Simple Troubleshootin g
Some possi b le reasons for the heater not operating
are:
1. Gas s u pply not "ON".
2. Electricity s u pply not "ON".
3. The time and/or temperat u re controls are not
"ON".
4. A limit s w itch may have operated. This may b e
ca u sed b y an interr u ption of the electrical
s u pply, fail u re of the distri bu tion fan or vent or
heat exchanger b lockage.
If a temperat u re limit s w itch persistently trips, there
is a fa u lt w hich m u st b e investigated b y a contractor
q u alified in the installation and service of gas-fired
heating eq u ipment.
12.3.1 Simple Troubleshootin g (Burner Fault)
If the bu rner fails to ignite for any reason, it w ill retry
for ignition (fo u r trials total). After fo u r u ns u ccessf u l
ignition trials, the control w ill p u t the heater into
locko u t for one ho u r.
Locko u t sho u ld not occ u r d u ring normal operation of
the heater and indicates there is a fa u lt condition
w hich m u st b e corrected. There is an LED light on
the ignition control that flashes codes to assist in
fa
u lt correction. See Page 31, Figure 15 for LED
indication codes.
Fi g ure 15: LED Dia g nostic Codes
Cut/Pinch Hazard
Wear protective gear
during installation,
operation and service.
Edges are sharp.
WARNING
Failure to follow these instructions can result in death, electric shock, injury or property damage.
Burn Hazard
Allow heater to cool
before service.
Tubing may still be hot
after operation.
Explosion Hazard
Turn off gas supply to
heater before service.
DANGER
Electrical Shock Hazard
Disconnect electric
before service.
Heater must be
connected to a properly
grounded electrical
source.
LED INDICATION FAULT MODE
Slo w Flash Normal Operation - No call for heat.
Fast Flash Normal Operation - Call for heat.
2 Flashes Ignition Locko u t - No flame detected.
3 Flashes Airflo w Fa u lt - Press u re s w itch open or closed.
4 Flashes Temperat u re Limit S w itch Open
5 Flashes Flame Sense Error - Gas valve not energized.
Steady On Internal Control Fail u re